//  Copyright 2018 Istio Authors
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.

package component

import "fmt"

// Instance of a key for identifying component variants.
type Key struct {
	ID
	Variant Variant
}

// String provides a brief one-liner containing ID and Variant. Useful for error messages.
func (k Key) String() string {
	if k.Variant != "" {
		return fmt.Sprintf("%s(%s)", k.ID, k.Variant)
	}
	return string(k.ID)
}
